on our second hatch and once again the americana hatch rate is low. This time we weighed the eggs each time we candled. By day 18, they had lost over the 15%. Although there was a variety in each of the 4 breeds we hatched, on the whole, the americanas lost the most humidity. Do they need more humidity to hatch? The eggs were from 20 wk. old pullets the first hatch and 23 wk. old pullets on the second hatch.